Bullet casings appear "inside" scope

[Gacu666]

Hi!

I looked everywhere but didn't find a solution to my problem unfortunately.

I played the game with my friends recently and we all noticed that there are weird texture glitches in the game that look like this:





Notice the bullet casings inside the scope?

Thats one of the problems. The other is muzzle flash that is showing on the foreground (before the scope, the crosshair etc) or the defiler bile covering my screen except my gun. Just like the game doesnt know which elements should be on the background.

The weird thing is that this happens on 3 different computers and that for a brief moment it was ok (for about 3-4 hours of playtime) and got screwed when we visited the first DLC.

The problem is that when this happens my FPS go down the drain, I have a 20-30% frames per second loss, which is weird.

I tried playing with in game options, no change whatsoever. I played with NVIDIA control panel, no change either.
I was also tinkering with the program Borderlands Config Editor 2.1.4, but it seems it didn't help a bit.

The weirdest thing is that the graphic glitch occured on all 3 computers at the same time... Any idea of what that might be?

We all have the Steam version of the game.

My specs:

Windows 7 64bit
AMD Athlon X2 5000+
Geforce 550 GTX 1024mb (296.10 drivers)
4gb DDR 2 800mhz

The other computer I have is:

Windows 7 64bit
Intel Pentium D 2.8ghz
Geforce 460 GTS 1024mb (296.10 drivers)
4gb DDR 2 800mhz

My friends comp is:

Windows 7 64bit
Amd Athlon II x4 635 2.9ghz
Geforce 460 GTX 1024mb (295.73)
4gb DDR3 1333mhz

[Gacu666]

Anyone?